Slip-gear.



"UNITED sTArns Y PATENT OFFICE.

COMPANY, OF CHICAGO, ILLINOI S, A CORPORATION 0F ILLINOIS.

SLIP'AGEAR.

Specification of Letters Patent.

Application tiled, January 9, 1908. Serial No. 409,947.

To all 'whom it may concern.

.Be it known that I, Janne W. Huellas, a l citizen of the United States. residing in Philadelphia, Pennsylvania. have invented certain Improvements 1n Slip-Gears', of

vwhich the following is a specification.

v The object of my invention is to provide a simple and accurate means for coupling a gear, sprocket or other wheel to a shaftso that when the gear is subjected to undue strains or shocks it will slip upon the shaft. This object I attain in the following manner, reference being had to the accompanying drawing, in which Figure l, is a longitudinal sectional View illustrating my invention as applied to a gear wheel; Fig. 2, is a sectional view on the line 2 2, Fig. 1; Fig. 3, is a perspective view of the spring member which is mounted between the gear wheel and the shaft; and Figs. 4' and 5, are views illustrating modifications of my invention. F ig. 6, is ay detached perspective View of the tapered pin shown in -F ig. 5.

A is a shaft having a key-way a.

B is a spring member in the form of a sleeve which is mounted upon the shaft and is made as clearly shown in Fig. 3, having a slot Z) which alines with the key-way in the shaft A and is locked to the shaft by a key c. The two portions b, l of this Sleeve are free at their outer ends and can be drawn toward each other by pressure but will expand when the pressure relieved due to the spring of the metal. Collars E, E are situated at each end of the` spring member and the'wheel D is mounted upon these collars and held central thereby in respect to the shaft. The collars being secured to the shaft by set screws fr, c prevent. any longitudinal movement of the parts on the shaft. The key 1 extends through the key-ways in the collars as well as through the ways in the spring member ll and the set screw c in one or both of the collars firmly locks the key againstlongitudinal movement.

rlhc collarsl shown in Fig. 'l are reduced at. one side c: lo form .shoulders ci" to receive ,the end thrust of thc gear .wheel and the reduced portions el enter the cavity, forming a bearing for the wheel. but the collars F., E may rest in recesses in tlu` end of the gear whccl l) and against shoulders f/ ou the wheel. as

shown in Fig. 4, if desired. .'lhus the parl.

are held rigidly together against longitudi- Patented Feb.4 22, 1910.

l nal movement., and the collars and the spring member are firmly secured to the shaft by `the key, while thelwheel l) is only held to the shaftthrough the friction of the spring member B.

"hile I have shown a gear wheel in the drawing it will be'understood that my in# vention can be applied to a sprocket wheel as well or to a belt wheel if desired. although the invention is particularly adapted to sprocket and gear wheelswhere the wheel subjected to a strain and shock in startil'l'g and stopping.

The cavity z' between the portions 7i of the spring member and the shaft is preferably filled with grease which may escape through the opening b2 between twol members b', thus lubricating the bearing surface of the spring member which is in Contact with the wheel.

To apply the spring member, the side portions b are drawn together so that the spring member will enter the opening in the sprocket, then it is forced into place under pressure, after which it is mounted upon the shaft with the gear wheel and the collars are set in position and secured to the shaft.

i In manufacturing the spring sleeve I preff erably make it in a single casting, dividing the two sections by cutting away a part of the cylinder to form the opening or slot b2. I can make the side sections bf ofany thickness desired;

In'Fig. 5, I have shown means for taking up the wear between the sleeve Vandthe member with inwardly extending flanges L and between the inner ends of these flanges one end, so that on screwing the nut upon the pin the two parts o of the spring member will be forced apart. The flanges f will yield with the side members b whenI the wheel is subjected to severe shocks or strains. Thus it will be seen that I provide a very simple and substantial device for coupling a gear or sprocket wheel or belt wheel to a shaft, which, when subjected to severe strains or shocks, will yield, preventing the breaking of the teeth of the sprocket or gear j wheel, or the breaking of the driving` mechl auism.

l claim -V l. The combination of a shaft; a hollou wheel section loose thereon; a. Spring section wheel and in this instance I make the spring' is mounted a tapered pin f having a nut at key-way l therein,

' taclen` secured to the shaft and having tivo curved integral spring arms tending Ato expand of i bearing against' themselves and normally the inner surface of the Wheel section; said Aarms being capable o l permitting the Wheel L sectionto slip when subjected to undue strains and shocks.

2. The `combination of a shaft, two collars mounted thereon and spaced apart, a hollow Wheel section mounted on the collars,l and a Spring member secured to tlie shaft and having two curved spring sections bearing against the inner surface of thehollow whee. section between the collars, the. wheel section being held to lthe.v shaft by the pressure of the spring section.

3. `hecombination of a shaft,two solid collars molmted thereon, and spaced apart,

`a wheel section mounted on the colhus and secured lto the shaft and sections curved and ada )ted to normally press upon the inner sur ace of the wheel section, the cavity between the collars forming a grease recepthe spring member having two sprlng 4. The combination ofl a shaft having a wheel, on the collars, a sprn mounted on .the shaft between t e collars on the shaft, av

member p collars, v l:-

l said spring member having a central portion with a longitudinal key-way therein, and having. two Side sections in theform of springs, the Wheel being held to the shaft by the lpressure of the side sections of the spring member, cach and a key adapted tothe key-Way in the l shaft and the key-ways in t c spring member and collars.

The combination of a shaft, a springl member thereon having springportions at each side curved toconorm to the bore of a vwheel and havin inturned spring flanges, means mounted between the flanges some distance from the' eriphery of the spring lmember for s reading thev side sections apart, and a w eel mounted 'on the s ring member, the whole being so constructe that the spring portions and their flanges. vvill vshocks and strains.

l In testimony whereof, I have signedl my name to this `s ecication, in the presence of two subscribing witnesses.-

JAMES W, HUGHES. n

Witnesses:

Jos. H. KLIN, -WM. A. Bann.

collar having key-Ways f yield when the wheel is subjected to severe 

